I'm new to iOS programming and seems to be having a hard time working with constraints. I added a textfield to the view and tried to position it where I placed it on the view. I added few constraints using the "Add New Constraints" button on the bottom right of the storyboard but the textfield position is still off when I run it on a simulator. Can someone help me please?
Update:
I tried adding these constraints but still no luck
So, for some bizarre reason, it started working after I changed my "view as: " option from an iPad to iPhone. Its not a proper solution but I am just going to use it temporarily.
You need right click the button in your storyboard and drag the constraints line to the related component.Then edit it.
demo
You can also add constraints by code,like vfl or masonry.
Every view in auto layout need to calculate position(x,y) and size(height, width) so that we have to add constraints to that particular view
For example:
mytextField I would like to align it in top of view with 10px from top of view and left, right 10px, height is 100px
Give constraints like place textfiled in view and add Top constraint and set value 10, add leading constraint set 10, add thrilling constraint
set it 10, and finally, add Height constraint 100
Then the text field will align at top of view with the required frame on any device.
you are using 'Horizontal center and vertical center' constraint, when you run app on different device other then the device you are using for design, TexField will be on different place because vertical center and horizontal center will be different on that screen.
User top, bottom,trailing and leading constraint to achieve this.
Related
I'm new to Auto Layouts and the concept of constraints. I'm currently trying to create a single view app with two buttons:
The buttons must meet the criteria shown in the image above. I can do everything except the two constraints where the buttons have to be a 30 above and 30 below, as it resizes the entire button to the point that one overlaps the other.
Is there any way to achieve this? I'm not doing the constraints programmatically, but rather on the storyboard. Many thanks.
Try put both of them in a view, add constraint between them 60px height, then make the view center of the superview, leading and trailing 20px, optional 50 from top and 150 from bottom, you should get the desired result.
The main issue here is to ensure that after setting alignment constraints both from the center, to select the following option of either the "bottom" or the "top" depending on how you want it:
This ensures that there is no "overlapping" caused.
I have 4 buttons which are supposed to be at the bottom of my screen, right next to each other -- 0 pixels apart. I want it to work for any screen size, or at least for iPhone 5, 6, and 6+. I'm trying to add constraints, but it doesn't do what I want it to do.
It's my first time working with Swift and XCode, please give me a hint.
Thanks in advance!
The best practice is to use UIStackView
Just drop it to storyboard
Add vertical spacing constraint to bottom layout guide
Add horizontal spacing constraints to leading and trailing of the superview
Add height constraint
Now add the buttons as subviews of the stack view
set the stack views properties: Horizontal, distribution and alignment as you want
Good luck
Options are:
Set up constraints correctly
Use a StackView
Use a TabBar format
Use a ToolBar
Or, complex-ish calculations in code.
Select all of the buttons in interface builder so they're all highlighted and bring up the "Add New Constraints" popover. Add the left, right, and bottom constraints, and check "Equal Widths".
I am new to iOS and am trying to align these TextFields in iOS. Below is how I would like it to look on an iPhone 7.
However, on the iPhone 7 Plus, the TextField shifts to the left of the center, despite my constraints.
Why is this? I have a constraint that aligns them to the Center, as seen on the right part of the screenshot.
It is very simple!! Just follow below steps,
Open you .xib or .storyboard file
Select view you have to add constraint
Click on align button at the right - bottom corner
Set horizontally in container constraint 0
Then press add constraints button
You can add any constraints to any view by following these steps
You just have to seth trailing and leading space fixed means both left
and right indicators should be red as shown in the screenshot.
For more details see the screenshots:
It will remain fixed from left and right in all the screens.
in your case is important set the width constraint.
However you can use trailing and leading constraints, in this way you will not need to set a defined width for your textfield and the position is correct for all type of devices.
If you want design like this so you have to take UITableview then take UITextfield for every cell beacuse you use every cell as view so easily manage all textfield and constraint. And also easily scrolling if device is display small.
I had inserted a ScrollView into UIViewController and dragged ScrollView to fill the space between the navigation bar and the RAM label below:
But when I run the app, the ScrollView does not fill the space:
Please help me! Thank you very much.
P/S: Sorry for my english is bad.
The scroll view is not covering up the whole thing because you are running the app on a much bigger phone. The simplest solution is to run the app on iPhone 5.
However, if you want to solve the problem on all sizes of iOS device, you need to add constraints.
Constraints are things that tells a view when and how much it should resize and where it should be positioned.
To add a constraint, just select the view you wish to add a constraint to and go to the bottom right corner. You will see 4 buttons:
The leftmost button is used to embedding views in stack views. This is a feature of iOS 9. If your deployment target is lower, just ignore it.
The second button to the left is for adding constraints related to alignment - where the edges of the views are, what its baseline is and where it is positioned in the X and Y axes:
The third button to the left is used to add constraint related to margins, width, height and how the width and height should change when it is asked to resize (keep the aspect ratio, for example):
The rightmost button is used to let Xcode decide what constraints you should add. And I think most of the times its choices are okay. Sometimes though, you still need to do some tweaking before it works.
"So... what constraints should I add?" you asked.
Well, I think I should teach you how to think when you want to add a constraint. This way, you can figure it out yourself in the future.
You should first let Xcode guess what constraints you want. Just click the rightmost button and click "Reset to Suggested Constraints". This can save a lot of work if Xcode can get it right. So remember to always do this first.
Then, run your app on various devices and see if the view's position, size, and alignment are as you expected. If it is not, you might have to add and/or remove some constraints.
For example, if you found that your view is always the same size on different devices, (that could be bad because it means that some content my go out of view on smaller devices) it's probably because Xcode added a width and/or height constraint to the view. You should delete that so that the view's width and/or height is not fixed.
You can find your view's constraints in the view hierarchy:
Just select the constraint and press delete.
Uncheck Adjust subview option and add
scrollview.view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
You need to add constraints for your scrollView. Set the leading and trailing constraints to 0. Pin the height of your scrollView and also don't forget to set the top layout constraint. You can either pin the height or add bottom layout constraint to your page control.
Constraints are very important and its even more important to set it correctly. Check the Apple Documentation - Working with constraints in IB
Uncheck constrain to margins and add 0 every one of the four limits of spacing to nearest neighbour.
My guess (from the little information we have) is that you are creating a constraint from your scrollview to the top of your view with a value equal to the height of the navigation bar. Set the value of this constraint to 0.
Just set the 4 constraints to 0 to the area you need and then uncheck the "Content Layout Guides" checkbox in the constraints tab here. It will automatically adjust to the area you have specified.
The checkbox to uncheck
Everything looks fine in IB. When I run my app using an iPhone5/iPhone6/iPad sims, it's completely mangled.
In IB:
In iPhone6 sim:
In the above sim, the buttons are cut. The textfield and textview are also cut. For the TF & TV, they are aligned center but trail off the edges on both sides.
I have the buttons width set
Editor > Pin > Widths Equally
The title label is set with a
Horizontal Center in Container
constraint
The textfield and textview also have
Horizontal Center in Container
and
Editor > Pin > Width
Is there some way to fix this?
-- EDIT --
After a few tries with constraints, looks like I have everything working except the two buttons.
Current listing of constraints:
As suggested by others, you should consider using the Auto-layout feature if you plan on constructing your views using the IB.
Here are some tutorial links:
RayWenderlich.com Part One
Youtube video This one covers a bit of size clases
Hope they help.
UPDATED:
I've read your updated post, you need to add width and height constraints. The view you see in the IB right now is 600 by 600 points, and the simulator one is smaller, which means that if you leave it as is, when you run the app you'll only see what the iphone screen has the capacity to show.
You need to add more constraints than what you used, try defining an equal width for the buttons, and assign the left one a left margin constraint, the right one a right margin constraint, give both of them vertical spacing constraint related to the text view or long label, the text view or long label should have left and right margin constraints, a height constraint and a top constraint to the textfield, the textfield should have a vertical spacing constraint to the label, also left and right and height constraint, and last the label should have leff, right and height constraints plus a top constraint to the main view.
I feel that those are all you need, but Xcode will through warnings at you if it feels you are missing something.
Try it, and let us know.